US4401805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified poly(ethylene terephthalate) having improved gas barrier properties
Assignee: Eastman Chemical Co
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Filing: 1982-03-01
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Granted: 1983-08-30
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Expires: 2002-03-01
Abstract
Abstract Disclosed are compositions having improved resistance to oxygen and carbon dioxide permeability comprising a copolyester derived from an acid component consisting essentially of 55-99 mol % terephthalic acid, 45-1 mol % of at least one acid of the formula HOOC--(CH 2 ) n --COOH where n is 1 to 6, and a glycol component, at least 60 mol % of which is ethylene glycol, the copolyester having an I.V. of about 0.1-1.5.
Inventors
- 👤 Doyle A. Weemes
- 👤 Robert W. Seymour
- 👤 Thomas H. Wicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A container having improved resistance to oxygen and carbon dioxide permeability comprising a copolyester derived from an acid component consisting essentially of 55-99 mol % terephthalic acid, 45-1 mol % of at least one acid of the formula HOOC--(CH 2 ) n --COOH where n is 1 to 6, and a glycol component, at least 60 mol % of which is ethylene glycol, said copolyester having an I.V. of about 0.1-1.5.
Claim 2
Dependent Claim
71 words
A container having improved resistance to oxygen and carbon dioxide permeability comprising a copolyester derived from an acid component consisting essentially of 55-99 mol % terephthalic acid, 45-1 mol % of at least one acid of the formula HOOC--(CH 2 ) n --COOH where n is 1 to 6, and a glycol component, at least 60 mol % of which is ethylene glycol, said copolyester having an I.V. of about 0.1-1.5.
Claim 3
Dependent Claim
43 words
A container according to claim 1 wherein said acid component consists essentially of about 65-75 mol % terephthalic acid and about 35-25 mol % of at least one acid of the formula HOOC--(CH 2 ) n --COOH where n is 1 to 6.
Claim 4
Dependent Claim
29 words
A container according to claim 1 wherein said acid having the formula HOOC--(CH 2 ) n --COOH is selected from the group consisting of succinic, glutaric, adipic and suberic.
Claim 5
Dependent Claim
46 words
A container according to claim 1 characterized in having an oxygen permeability of less than 8, measured as cubic centimeters permeating a 1 mil thick sample, 100 inches square, for a 24 hour period under an oxygen partial pressure difference of 1 atmosphere at 30° C.
Claim 6
Dependent Claim
46 words
A container according to claim 2 characterized in having an oxygen permeability of less than 8, measured as cubic centimeters permeating a 1 mil thick sample, 100 inches square, for a 24 hour period under an oxygen partial pressure difference of 1 atmosphere at 30° C.
Claim 7
Dependent Claim
46 words
A container according to claim 3 characterized in having an oxygen permeability of less than 8, measured as cubic centimeters permeating a 1 mil thick sample, 100 inches square, for a 24 hour period under an oxygen partial pressure difference of 1 atmosphere at 30° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |